Electronic equipment incorporating an integrated BTL circuit

Details Electronic equipment incorporating an integrated BTL circuit Electronic equipment incorporating an integrated BTL circuit

1991-03-13

1993-08-03

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

340652, 324503, G01R 3102

Patent

active

052334961

ABSTRACT:
A low-frequency power amplifier with an integrated BTL output circuit drives a load. The amplifier incorporates a bias circuit for supplying a bias voltage to each circuit composing the amplifier, a control circuit for switching between the normal operation mode and the mode for detecting the load being in an open-circuit condition, a detector circuit for detecting the load being in an open-circuit mode by supplying current to the load and sensing the current flowing through the load, and an output circuit for telling an external circuit of the integrated circuit that the load is in an open-circuit mode. All these circuits are squeezed into a single chip. The control circuit controls the bias circuit and detector circuit. During normal operation, the BTL output circuit is in an operative state, while the detector circuit is in a nonoperative state. When the load is detected being in an open-circuit mode, the bias circuit is forced to stop operation, which causes the BTL output circuit to stop operation, thereby enabling the detector means to sense that the load is in an open-circuit mode.

REFERENCES:
patent: 3849772 (1974-11-01), Burnett
patent: 3989908 (1976-11-01), Budrys
patent: 3990020 (1975-11-01), Porter, III
patent: 4612453 (1986-09-01), Yamazaki
patent: 4799019 (1989-01-01), Cooley
patent: 4894605 (1990-01-01), Ringleb
patent: 4962350 (1990-10-01), Fukuda
European Search Report: Patent Abstracts of Japan, Power Distributor Circuit, vol. 4, No. 63 (E-10) (545), May 13, 1990, Tokyo Shibaura Denki, KK.
Patent Abstracts of Japan, Load Disconnection Detector, vol. 10, No. 157 (P-464), Jun. 6, 1986, Tateishi Denki, KK.
Patent Abstracts of Japan, Power Amplifier Circuit, vol. 13, No. 320 May 26, 1989, (E-764) 3578), NEC Corp.

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